Fertilization and nutrient management trials in peanut


Board of Regents of the University System of Georgia on behalf of the University of Georgia Cooperative Extension Service and University of Georgia Research Foundation, Inc.

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Southeast (GA, FL, AL)

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Ongoing studies evaluate the response of peanut to boron {B) and calcium {Ca) fertilization. Products used in the boron study included Borosol-10 (boric acid), Solubor (sodium borate), and Boron Xtra {Custom Ag Formulations, Fresno, CA). Treatments included single applications of Borosol-10 at rates of 0.25, 0.50, and 1.00 lb B acre·1 (0.28, 0.56, and 1.12 kg B ha·1); Borosol-10 split applied at overall rates of 0.50 and 1.00 lb B acre·1 (0.56 and 1.12 kg B ha·1); Solubor applied at 1.00 and 2.00 lb B acre·1 {1.12 and 2.24 kg B ha-1); Boron Xtra applied at 0.02 lb B acre·1 (0.02 kg B ha·1); and an untreated control. Various sources of calcium were evaluated alone or as supplemental treatments. Calcium studies included an untreated control, gypsum {1000 lb acre·1 and 500 lb acre-1), lime {1000 lb acre·1), Black Gypsum {1000 lb acre·1; The Andersons, Inc., Maumee, OH), AgriMend gypsum {1000 lb acre-1; AgriFarm Group, Colorado Springs, CO), and Full Measure Cal {3 gal acre·1; Full Measure LLC, Bristol, RI). Yield and grade responses to treatment were not observed, and minor incidence of B-deficient seed was observed only in one year of the study. While applied B did not affect seed B, applied B described 83% of leaf B variability. Solubor applied at 2.24 kg B ha-1 was the most effective treatment for increasing leaf tissue B, and this high rate did not result in B toxicity. Yield and grade were not increased by Ca treatments, which is likely due to adequate initial soil test Ca levels {>150 mg kg-1). Seed Ca was increased by Ca additions in 2016 and 2017 with 57 and 36% of the variability in seed Ca explained by applied Ca rate in each year, respectively. Lime and gypsum applications consistently resulted in seed and soil Ca levels above the untreated control. 

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